What’s the best holster style for carrying a Glock 21?

OWB holsters work best for open carry, range use, and duty applications due to the Glock 21’s size. IWB holsters also support concealed carry with proper clothing.

Can I conceal carry a Glock 21 comfortably?

Yes, with the right holster. Hybrid IWB holsters that distribute weight and minimize printing make the Glock 21 viable for concealment—even for larger-framed pistols.

What retention options are available for Glock 21 holsters?

You’ll find Level 1 passive retention holsters, as well as Level 2 and Level 3 active retention options with thumb-release mechanisms for law enforcement or tactical use.

Is the Glock 21 compatible with light-bearing holsters?

Yes. Some models in this collection accommodate popular weapon lights. Check product specs for light-bearing compatibility before ordering.

Are Glock 21 holsters available for left-handed users?

Absolutely. Alien Gear offers left-hand and right-hand draw options across IWB, OWB, and duty holster styles for the Glock 21.

Can I use a Glock 21 holster for Glock 20 or Glock 41?

No. Despite similar frames, each Glock variant has unique dimensions. Always choose a holster molded specifically for the Glock 21 for proper fit and safe retention.

What materials are used in Glock 21 holsters?

Alien Gear holsters combine polymer shells for firearm retention with padded neoprene or rigid backers for comfort and durability in all-day wear.

What’s the best Glock 21 holster for duty use?

Rapid Force Level 2 and Level 3 OWB holsters offer professional-grade retention, secure belt mounts, and quick-draw access, ideal for law enforcement and security personnel.

Can I carry a Glock 21 with an optic or suppressor height sights?

Some holsters support optics-ready slides or taller sights. Choose holsters marked as "optic-compatible" if your Glock 21 is upgraded with red dots or taller irons.

Does Alien Gear offer modular holsters for Glock 21?

Yes. The ShapeShift system allows Glock 21 owners to switch between appendix, OWB, shoulder, and more—all with one shell and multiple carry platforms.

Collection: Glock 21 Holsters for Concealed & Open Carry

The Glock 21 delivers .45 ACP stopping power with a full-size frame, and it demands a holster that handles both bulk and recoil without compromise. Alien Gear holsters for Glock 21 are engineered for heavy-duty performance—whether you're carrying concealed, patrolling with a duty belt, or running drills at the range. Each holster offers custom-molded retention, rugged materials, and multiple carry configurations to match your needs. From OWB tactical setups to IWB concealed carry options, these holsters keep your Glock 21 secure and accessible without sacrificing comfort.